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Fair Value Measurements and Derivative Instruments - Schedule of Fair Value and Line Item Caption of Derivative Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Derivative Financial Instruments    
Asset Derivatives    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Liability Derivatives    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative financial instruments Derivative financial instruments
Other Assets    
Asset Derivatives    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative financial instruments Derivative financial instruments
Other long-term Liabilities    
Liability Derivatives    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other long-term liabilities Other long-term liabilities
Designated as Hedging Instrument    
Asset Derivatives    
Asset Derivatives [1] $ 71 $ 144
Liability Derivatives    
Liability Derivatives [1] 139 66
Interest rate swaps | Designated as Hedging Instrument | Derivative Financial Instruments    
Asset Derivatives    
Asset Derivatives [1] 0 1
Liability Derivatives    
Liability Derivatives [1] 0 0
Interest rate swaps | Designated as Hedging Instrument | Other Assets    
Asset Derivatives    
Asset Derivatives [1] 58 75
Interest rate swaps | Designated as Hedging Instrument | Other long-term Liabilities    
Liability Derivatives    
Liability Derivatives [1] 0 0
Foreign currency forward contracts | Designated as Hedging Instrument | Derivative Financial Instruments    
Asset Derivatives    
Asset Derivatives [1] 0 20
Liability Derivatives    
Liability Derivatives [1] 71 9
Foreign currency forward contracts | Designated as Hedging Instrument | Other Assets    
Asset Derivatives    
Asset Derivatives [1] 0 44
Foreign currency forward contracts | Designated as Hedging Instrument | Other long-term Liabilities    
Liability Derivatives    
Liability Derivatives [1] 22 4
Fuel swaps | Designated as Hedging Instrument | Derivative Financial Instruments    
Asset Derivatives    
Asset Derivatives [1] 10 4
Liability Derivatives    
Liability Derivatives [1] 19 26
Fuel swaps | Designated as Hedging Instrument | Other Assets    
Asset Derivatives    
Asset Derivatives [1] 3 0
Fuel swaps | Designated as Hedging Instrument | Other long-term Liabilities    
Liability Derivatives    
Liability Derivatives [1] $ 27 $ 27
[1] Subtopic 815-20 “Hedging-General” under ASC 815.